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Old 12-12-2013, 04:45 PM   #1
trueno92
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Default Switching ground question? WigWag signal/parking light

Been doing some digging and come summer, i'll be fitting the WRC bumper on my 02 wrx.

The launsport/burn-up piece also has a signal light in the bumper to accomodate the rally headlights (with no signal lamp)

I will be running headlights with signal lamps and want the bumper signal lamp to be on all the time (from parking light power 12v).

I found this:
http://forums.nasioc.com/forums/show...4&postcount=13

wire one side of the bulb to the hot side of the Parking lights
wire the other side to the hot side of the turn signal.

in order for the bulb to light, it must have a hot side & a ground.
if both the parking lights and the turn signal are off - there is no voltage, side marker is off
if both the parking light and the turn signal are on, there is no ground, side marker is off
if parking light is on, and turn signal is off, side marker is lit (power thru parking light, ground thru turn signal)
if parking light is off and turn signal is on, side marker is lit (power thru turn signal, ground thru parking light)

so, when your lights are on, the side marker is lit, and the bulb goes "off" when turn signal on that side lights, making it flash out of time w/ turn signal.
when your lights are off, the side marker is off and lights when the turn signal on that side lights, making it flash in time with turn signal.

it is an incredibly elegant solution.
I believe the reason it "works" is because each of the hot wire "see" the ground thru their bulbs filament when the hot wire is not powered.

is anyone doing this, relay-less solution?

It will allow my bumper light to be on as a parking light and then alternate flash when my signal lights are activated.

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Old 12-12-2013, 05:49 PM   #2
Cougar4
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The description of the way the circuit works is correct but in order for that to work like you want it to the added light has to draw a lot less power than the turn signal or parking light bulbs since they form a series circuit. If they were each the same wattage then they would light up equally the same amount.
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Old 12-12-2013, 05:50 PM   #3
Big-E
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This is a common application in many USDM vehicles (but is not allowed in Europe and other countries).

This is a floating-ground system.

Parking lamp off, turn signal on > flashing bulb in unison with other flashing bulbs
Parking lamp on, turn signal on > flashing bulb in opposition to other flashing bulbs (this is the 'not allowed in Europe application')

The same single-filament bulb is used; not a dual-filament bulb.

This will not work with LED bulbs, only traditional incandescent bulbs.
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Old 12-12-2013, 05:59 PM   #4
satrya
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I followed instruction from a much earlier thread (back in the early 2000's) and got that same result. The sidemarkers use LED, while the turn signal is the oem amber incandescent bulb.

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Old 12-12-2013, 07:25 PM   #5
trueno92
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Hey satya, I caught some of your work on the bugeye headlight mods you were working on.
Did you use the above mentioned method?

Thanks for all the feedback guys, the bulbs I am using are wedge equivalent and seem to build in to a 2.5" arcrylic housing, I think it's a common marker lamp unit.
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Old 12-12-2013, 08:17 PM   #6
satrya
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It looks like it. It's been almost a decade since I did the mod, so I don't recall exactly if that's the very same combination of rewiring. But I think there should be only one or very few possible combinations that can make this happen.

Just to be safe, you might want to start with the incandescent bulbs first on both the turn signal and the sidemarker. That way, the issue is only to work out how the floating ground and positive are correctly assigned. Then, you can replace the bulb with LED. Whenever it doesn't work, simply reverse the polarity of the LED bulbs. If you start with LEDs already in the mix, it may be hard to determine if things don't work because of the basic wiring of the floating ground is incorrect, or the LEDs are reversed.
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Old 04-25-2014, 10:25 AM   #7
trueno92
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just want to let you guys know that you nailed it.

parking/sidemarker light + and signal + to the Wig-Wag indicator and it worked perfectly - i left the bulbs out of the sidemarker and it still works no prob.

Here is a video - i love it!

www.youtube.com/watch?v=kfcy783da_k
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Old 04-25-2014, 02:14 PM   #8
satrya
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^
Glad to hear.
I thought the sidemarkers are also connected? It doesn't seem like it in that video.
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